有do就没to，没do就有to 当but前的谓语结构是do时，或者定语从句中有do时，but后面不用to there is nothing to do but stay here. Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现在时且主语是复数we,they, Statins block an enzyme the liver needs to make cholesterol.
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现在完成时：have/has+done ， 过去完成时：had+done，现在进行时态：be动词＋doing，过去进行时（被动语态）：was／were＋doing， 一般现在时：do、does，一般过去时：did。 一、含义 v. Do （务必）be careful next time. Do come in and sit down.
这个do sth是“不带to的不定式”。也就是说：make sb do sth=make sb to do sth.
But having too much cholesterol in the blood raises the risk of heart attacks and strokes. Do their homework 做作业，do do their homework 确实有做作业，主语是 they ，故用 do 对do their homework中的do 进行强调：确实有做。 I have no choice but to stay here. He does come here every day.
Do （务必）come on time next time. He did come here yesterday. What's different and what's alike between these two kinds of health care providers? The boys do do their homework after school every day.
一，没有make sb to do的说法，这个没有什么理由，就是这样用。make sb do sth.
Means, but what does d.o.
